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잔류 응력 해석과 연계된 실린더 헤드 내구 해석 기법 개발
방인완(In-Wan Bang),장훈(Hoon Chang),박관흠(Kwan-Hum Park) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
CAE techniques for durability analysis are essential support tools to the design process for automotive parts. The reliability and the improvement of engine durability analysis can be achieved when the results such as residual stress distribution are considered with the structural analysis. In this study, the residual stress distribution was simulated during heat treatment of a cylinder head for diesel engine. The thermal history of the cylinder head was measured to calculate heat transfer coefficient during quenching and validate the simulation results. The residual stresses were also measured after heat treatment and the calculated residual stress distribution was in good agreement with the measured values. Considering the calculated residual stresses distribution as initial stresses, the cylinder head/block compound structural analysis was carried out to evaluate the durability of the cylinder head during engine running condition. It was possible to evaluate the effects of residual stresses on the engine durability quantitatively by this procedure. This integration between process simulation and structural simulation is expected to make a contribution to the reduction of design period and the increase of engine durability being applied in the early design stage.
잔류 응력 해석과 연계된 실린더 헤드 내구 해석 기법 개발
방인완(In-Wan Bang),장훈(Hoon Chang),박관흠(Kwan-Hum Park) 한국자동차공학회 2005 한국자동차공학회 Symposium Vol.- No.-
CAE techniques for durability analysis are essential support tools to the design process for automotive parts. The reliability and the improvement of engine durability analysis can be achieved when the results such as residual stress distribution are considered with the structural analysis. In this study, the residual stress distribution was simulated during heat treatment of a cylinder head for diesel engine. The thermal history of the cylinder head was measured to calculate heat transfer coefficient during quenching and validate the simulation results. The residual stresses were also measured after heat treatment and the calculated residual stress distribution was in good agreement with the measured values. Considering the calculated residual stresses distribution as initial stresses, the cylinder head/block compound structural analysis was carried out to evaluate the durability of the cylinder head during engine running condition. It was possible to evaluate the effects of residual stresses on the engine durability quantitatively by this procedure. This integration between process simulation and structural simulation is expected to make a contribution to the reduction of design period and the increase of engine durability being applied in the early design stage.
유한요소법에 의한 천연가스 배관의 다층 맞대기 용접시의 열전달과 응력 해석
김우식,오규환,이용기,방인완,김영균 대한금속재료학회(대한금속학회) 1997 대한금속·재료학회지 Vol.35 No.8
Heat transfer, residual stresses and deformations during a multi-pass butt-welding of natural gas(NG) pipes have been analyzed using a 2-dimensional thermo-elastoplastic finite element method. A double ellipsoidal power density distribution model has been used to take into account the heat distribution by a moving arc, and an element birth technique has keen also used to model the multi-pass welding. The calculated sizes of FZ and HAZ are in good agreement with the experimentally measured one. The maximum residual effective stresses and effective plastic strain are found to be developed in the boundary between FZ and HAZ. The hoop residual stresses of inner surface of pipe are determined at the 1 and 2-pass of welding and those of outer surface are determined at the 3-pass of welding.